VDB

CVE-2026-109783

CVE-2026-109783 PUBLISHED CVSS 8.3 HIGH

Reported by mozilla · Published October 13, 2026

Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox ESR 153.5 and Thunderbird 153.5.

Risk Scores

CVSS 3.1
8.3
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected Products

VendorProductVersions
MozillaFirefox153.5
MozillaThunderbird153.5
MozillaThunderbird153.5
chainguardfirefox-esr-1400
MozillaFirefox153.5

Timeline

  • Oct 13, 2026 Coalition ESS Score
  • Oct 13, 2026 CVE Published
  • Oct 14, 2026 EPSS Score
  • Oct 16, 2026 EPSS Score
  • Oct 25, 2026 EPSS Score
  • Oct 26, 2026 CVE Updated
  • Oct 27, 2026 EPSS Score
  • Oct 29, 2026 EPSS Score

References

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